package com.wires.lu.practice;

import java.sql.Time;
import java.util.concurrent.TimeUnit;

class HoldLockThread implements  Runnable{
    private String lockA;
    private String lockB;

    public HoldLockThread(String lockA, String lockB) {
        this.lockA = lockA;
        this.lockB = lockB;
    }

    @Override
    public void run() {
        synchronized (lockA){
            System.out.println(Thread.currentThread().getName()+"\t 自己持有"+lockA+"\t 尝试获得："+lockB);
            try {
                TimeUnit.SECONDS.sleep(2);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            synchronized (lockB){
                System.out.println(Thread.currentThread().getName()+"\t 自己持有"+lockB+"\t 尝试获得:"+lockA);
            }
        }

    }
}

/**
 * 死锁
 * 死锁是指两个或者两个以上的进程再执行过程中
 * 因争夺资源而造成的一种相互等待的现象
 * 若无外力干涉那他们都将无法推进下去
 */

public class DeadLockDemo {
    public static void main(String[] args) {
        String lockA="lockA";
        String lockB="lockB";
        new Thread(new HoldLockThread(lockA,lockB),"ThreadAAA").start();
        new Thread(new HoldLockThread(lockB,lockA),"ThreadBBB").start();
        //jps -l 定位故障
        //jstack +进程号： 查看故障详情

    }
}
